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Comparative Study of Hot Corrosion Behavior of the Enamel Based Composite Coatings and the Arc Ion Plating NiCrAlY on TiAl Alloy
Liao Yimin1; Feng Min1; Chen Minghui1; Geng Zhe2; Liu Yang3; Wang Fuhui1; Zhu Shenglong3
Corresponding AuthorChen Minghui(mhchen@mail.neu.edu.cn)
2019-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:2Pages:229-237
AbstractTiAl intermetallic alloys have attracted great attention for its potential application in preparing low pressure turbine blades in aircraft engine. However, its poor oxidation and corrosion resistance becomes a challenge at temperatures above 800 degrees C, which leads to the developing of protective coatings. Enamel coating is considered as one of the candidates that match the TiAl alloy well, meanwhile provide corrosion protection. Enamel coating has many advantages such as high thermochemical stability, adjustable thermal expansion coefficient and simple preparation process. This study comparatively investigates hot corrosion behavior of the Ti-45Al-2Mn-2Nb alloy, the traditional NiCrAlY coating and the enamel based composite coating in (75%Na2SO4+25%NaCl, mass fraction) melted salt. Results indicate that after 80 h of hot corrosion, the bare alloy has completely destroyed. For the NiCrAlY coating, it protects the underlying alloy well by forming a protective Al2O3 scale initially. However, serious interdiffusion between coating and substrate results in the degeneration of the coating as well as the scale. At the same time, the basic dissolution of Al2O3 film accelerates corrosion. So obvious spallation takes place after 60 h corrosion. The enamel based composite coating shows excellent thermal stability and low corrosion rate. During the whole hot corrosion test, it still retains its original blue glazing color and luster. Furthermore, the enamel coating suppresses the inward diffusion of oxygen and corrosive ions into the alloy substrate, and thus, it protects the TiAl alloy well from corrosion of the molten (75%Na2SO4+25%NaCl, mass fraction) salt.
Keywordenamel coating hot corrosion NiCrAlY coating TiAl alloy
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Natural Science Foundation of Jiangsu Province of China ; Natural Science Foundation of Jiangsu Higher Education Institutions
DOI10.11900/0412.1961.2018.00293
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51471177] ; National Natural Science Foundation of China[51871051] ; Fundamental Research Funds for the Central Universities[N160205001] ; Natural Science Foundation of Jiangsu Province of China[BK20160353] ; Natural Science Foundation of Jiangsu Higher Education Institutions[16KJB460032]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000455945800007
PublisherSCIENCE PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131203
Collection中国科学院金属研究所
Corresponding AuthorChen Minghui
Affiliation1.Northeastern Univ, Shenyang Natl Key Lab Mat Sci, Shenyang 110819, Liaoning, Peoples R China
2.Suzhou Inst Ind Technol, Dept Precis Mfg Engn, Suzhou 215104, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Liao Yimin,Feng Min,Chen Minghui,et al. Comparative Study of Hot Corrosion Behavior of the Enamel Based Composite Coatings and the Arc Ion Plating NiCrAlY on TiAl Alloy[J]. ACTA METALLURGICA SINICA,2019,55(2):229-237.
APA Liao Yimin.,Feng Min.,Chen Minghui.,Geng Zhe.,Liu Yang.,...&Zhu Shenglong.(2019).Comparative Study of Hot Corrosion Behavior of the Enamel Based Composite Coatings and the Arc Ion Plating NiCrAlY on TiAl Alloy.ACTA METALLURGICA SINICA,55(2),229-237.
MLA Liao Yimin,et al."Comparative Study of Hot Corrosion Behavior of the Enamel Based Composite Coatings and the Arc Ion Plating NiCrAlY on TiAl Alloy".ACTA METALLURGICA SINICA 55.2(2019):229-237.
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